Baby steps: investigating the development of perceptual–motor couplings in infancy

There are cells in our motor cortex that fire both when we perform and when we observe similar actions. It has been suggested that these perceptual‐motor couplings in the brain develop through associative learning during correlated sensorimotor experience. Although studies with adult participants have provided support for this hypothesis, there is no direct evidence that associative learning also underlies the initial formation of perceptual–motor couplings in the developing brain. With the present study we addressed this question by manipulating infants’ opportunities to associate the visual and motor representation of a novel action, and by investigating how this influenced their sensorimotor cortex activation when they observed this action performed by others. Pre‐walking 7–9‐month‐old infants performed stepping movements on an infant treadmill while they either observed their own real‐time leg movements (Contingent group) or the previously recorded leg movements of another infant (Non‐contingent control group). Infants in a second control group did not perform any steps and only received visual experience with the stepping actions. Before and after the training period we measured infants’ sensorimotor alpha suppression, as an index of sensorimotor cortex activation, while they watched videos of other infants’ stepping actions. While we did not find greater sensorimotor alpha suppression following training in the Contingent group as a whole, we nevertheless found that the strength of the visuomotor contingency experienced during training predicted the amount of sensorimotor alpha suppression at post‐test in this group. We did not find any effects of motor experience alone. These results suggest that the development of perceptual–motor couplings in the infant brain is likely to be supported by associative learning during correlated visuomotor experience.     

Itinerant surfaces with spin-orbit couplings,correlations and external magnetic fields: exact results

We analyze, in exact terms, multiband 2D itinerant correlated fermionic systems with many-body spin-orbit interactions, and in-plane external magnetic fields. Even if such systems with broad applicability in leading technologies are non-integrable, we set up an exact solution procedure for them, which is described in details. Casting the Hamiltonian in positive semidefinite form, the technique leads to the ground state, and also characterises the low lying excitation spectrum.     

Transformations in the couplings among intellectual abilities and constituent cognitive processes across the life span

Abstract— Two-component theories of intellectual development over the life span postulate that fluid abilities develop earlier during child development and decline earlier during aging than crystallized abilities do, and that fluid abilities support or constrain the acquisition and expression of crystallized abilities. Thus, maturation and senescence compress the structure of intelligence by imposing age-specific constraints upon its constituent processes. Hence, the couplings among different intellectual abilities and cognitive processes are expected to be strong in childhood and old age. Findings from a population-based study of 291 individuals aged 6 to 89 years support these predictions. Furthermore, processing robustness, a frequently overlooked aspect of processing, predicted fluid intelligence beyond processing speed in old age but not in childhood, suggesting that the causes of more compressed functional organization of intelligence differ between maturation and senescence. Research on developmental changes in functional brain circuitry may profit from explicitly recognizing transformations in the organization of intellectual abilities and their underlying cognitive processes across the life span.     

Structural couplings between individual development and the epigenesis of family relations in schizophrenia: An eight-year follow-up

The aim of this research was to study individual development along with the epigenesis of family relations in an eight-year follow-up of schizophrenia. The five epigenetic phases described by Wynne are attachment/caregiving, communicating, joint problemsolving, mutuality, and intimacy. Results showed that the critical level of epigenesis was the communicating level; its resolution was statistically significantly connected to good prognosis concerning individual parameters. The mother-child dyad was usually epigenetically the most developed dyad in the family. We think this study gives a new paradigm for understanding connecting interconnections between individual and family dynamics in schizophrenia and valuable information for planning the integrated and need-specific treatment of schizophrenia and evaluating the course and prognosis of schizophrenia.This study was carried out at the Clinic of Psychiatry of the University of Turku, Finland, and financially supported by the Academy of Finland. The head of the project was Professor Yrjö O. Alanen. We have also been in cooperation with and received valuable constructive criticism from Professor Lyman C. Wynne, whose theoretical model we applied in this study. Ms. Birgitta Nolvi's secretarial work was greatly appreciated.